Stratijied Bocks near Killarney and Dublin, 167 
From Ferriter^s Cove, 
Atrypa tenuistriata,Sil.Syst. pi. 12. f.3. Euomphalus perturbatus, Sil. Syst. 
Aviciila reticulata, Ib. pi. 6. f.3. pi. 22. f. 15. 
retroflexa, Ib. pi. 5. f. 9. Leptaena lata, Ib. pi. 5. f. 3. 
Cornulites serpuIarius,/A pi. 26. f. Terebratula bidentata, Ib. pi, 12. 
5-9. f. 13. 
Euomphalus funatus, Ib. pi. 12. f. Stricklandii, Ib. pi. 
20. 13.f.l9. 
If we make a section across the Dingle peninsula from 
Feilatiirrive on the south to Brandon Bay on the north, we 
find that the strata consist of a base of dark blackish gray 
clay slate, the upper beds of which alternate with reddish 
purple slate, some of which contain Silurian fossils ; these 
strata are succeeded by red slaty conglomerates, alternating 
with red and green slate and brown quartz rock, above which 
are chloride quartz rocks with alternating purplish and red- 
dish gray clay slate, similar in composition and character to 
those of the Gap of Dunloe, and of that district generally. 
Again, if we make a section along the west coast of the Dingle 
peninsula from Fawn to Sybil Head, we find numerous fos- 
siliferous beds, some of which have been noticed by Mr. Ha- 
milton*, the true position of which has not yet been clearly 
made out ; but from all the data I possess, I am inclined to 
place them between the dark gray clay slate and the chloride 
quartzose rock. Hence I am of opinion that the chloride 
rocks of the Gap of Dunloe should be classed with the Silurian 
system. 
With regard to the dark blackish gray clay slate which 
forms the lowest member of the series in the Dingle penin- 
sula, it is identical in lithological character with the dark 
gray slate of the Gatties mountains, which are situated directly 
in the line of the strike in an eastern direction, as may be 
clearly seen by reference to my Geological map ; and follow- 
ing the same strike similar strata occur in the Shivnamanna 
mountains of the county of Kilkenny, and also in the 
slate district to the south of Waterford, where on the sea 
coast at Knockmahon, and also at Tramore, fossils occur in 
green, chloride metamorphic slate and quartz rock, belonging 
to the lower Silurian strata or Caradoc sandstone f. These 
fossiliferous beds are incumbent on the dark gray slate, in 
which no fossils have as yet been observed. This dark gray 
slate bears a striking resemblance in lithological character to 
the dark gray clay slate of the Festiniog district of Merioneth- 
* See Journal of the Geological Society of Dublin, vol. i. p. 280. 
I The fossils discovered are Orthis radiatusy and several others of that 
genus; so Bellerophon bilobatus, Atrypa orbicularis?, &Q. 
